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EMPLOYEE BENEFITS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employee stock ownership plan, maximum employer contribution as a percentage of participant's qualified compensation | 5.00% |  |
Employee stock ownership plan, total contributions accrued or paid | $ 343 | $ 301 |
Employee stock ownership plan, shares held under plan (in shares) | 1,322,530 |  | 1,333,504
Employee stock ownership plan, unallocated shares (in shares) | 0 |  | 0
Cash surrender value of life insurance | $ 26,458 |  | $ 26,301
Bonus expense | 715 | 819 |
Executive Incentive Retirement Plan | Postretirement Life Insurance | Nonqualified Plan | Unfunded Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of life insurance | 26,458 |  | 26,301
Plan cost | 285 | $ 275 |
Plan obligation | $ 3,893 |  | $ 3,667

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